John Britten designed and built these amazing machines: they have (at least) 5 major design elements: "skin & bones" carbon fiber wheels, beam suspension with no "stiction" and controllable geometry, 4-valve hand cast stressed member engine in frame-less chassis, unique aerodynamics (dubbed "torpedo over blade"), and the fully ducted cooling system that made this narrow design possible. It weighs just 145kg (320 pounds).
John Britten on Wikipedia
These are especially delicious for us aspiring engineering types!
Front view showing cooling intake scoops:
Profile/side view showing all the goodness (carbon fiber wheels and beam suspension, stressed member engine, unique aerodynamics):
Rear cooling exhaust vent:
